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Music Videos Copies in YouTube
Music Videos Copies in YouTube
Music Videos Copies in YouTube
Music Videos Copies in YouTube
Music Videos Copies in YouTube
Music Videos Copies in YouTube
Music Videos Copies in YouTube
Music Videos Copies in YouTube
Music Videos Copies in YouTube
Music Videos Copies in YouTube
Music Videos Copies in YouTube
Music Videos Copies in YouTube
Music Videos Copies in YouTube
Music Videos Copies in YouTube
Music Videos Copies in YouTube
Music Videos Copies in YouTube
Music Videos Copies in YouTube
Music Videos Copies in YouTube
Music Videos Copies in YouTube
Music Videos Copies in YouTube
Music Videos Copies in YouTube
Music Videos Copies in YouTube
Music Videos Copies in YouTube
Music Videos Copies in YouTube
Music Videos Copies in YouTube
Music Videos Copies in YouTube
Music Videos Copies in YouTube
Music Videos Copies in YouTube
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Music Videos Copies in YouTube

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  • 1. Music  Videos  Copies   in  YouTube Project  Presenta,on 12/15/10 Ma3hias  Prellwitz Advisor:  Dr.  Nelson
  • 2. Linking  to  a  par7cular  copy“Rolling  Stones  -­‐  Sa7sfac7on”ODU  CS  895  F10 Videos  Copies  in  YouTube12/15/10 Ma3hias  Prellwitz 2
  • 3. Metadata  lost  when  YouTube  video  disappears video  7tle     The  Rolling  Stones  -­‐  Sa7sfac7on url       hCp://www.youtube.com/watch?v=214szPQBUYcODU  CS  895  F10 Videos  Copies  in  YouTube12/15/10 Ma3hias  Prellwitz 3
  • 4. Metadata  hard  to  recover  fromSearch  EnginesODU  CS  895  F10 Videos  Copies  in  YouTube12/15/10 Ma3hias  Prellwitz 4
  • 5. But  nearly  300  copies  remain  in  YouTubeODU  CS  895  F10 Videos  Copies  in  YouTube12/15/10 Ma3hias  Prellwitz 5
  • 6. Linking  music-­‐related  URIs‣ Transparent  URI  seman,cs ‣ h3p://www.last.fm/music/John+Lennon/_/Imagine ‣ h3p://www.ilike.com/ar,st/The+Cribs/track/I%27m+A+Realist ‣ h3p://www.last.fm/music/Johnny+Cash/_/Highwayman‣ Opaque  URI  seman,cs ‣ h3p://vids.myspace.com/index.cfm?fuseac,on=vids.individual&videoid=5168491 ‣ h3p://www.youtube.com/watch?v=VST2KKIYn50ODU  CS  895  F10 Videos  Copies  in  YouTube12/15/10 Ma3hias  Prellwitz 6
  • 7. Popular  Music   US  Top  40  Singles  Charts  of  9/25/10 N/A Percentage & Country 61 - 70 Blues 51 - 60 Childrens 41 - 50 Classical 31 - 40 Electronic 21 - 30 Folk 11 - 20 Funk / Soul 1 - 10 Hip Hop Jazz Latin Non-Music Pop Reggae # Songs Rock 11 - 15 Stage & Screen 6 - 10 World 1-5 N/A 1960 1970 1980 1990 2000 2010 Dataset: USA Singles Top 40 of 9/25/10, Number of set items: 49Figure 1: Set distribution: Genre/Publication Year, Dataset: US Singles Charts Top 40 of 9/25/10, against Source: www.discogs.com; Multiple genre assignments possibleDiscogs. Number of items: 493.3.2 Music Blogs Finishing with a broader view of popularity in terms ofDisregarding the current popularity of a song by its chart music, ”The 500 Greatest Songs of All Time” are be-ranking lead to approach of checking sites frequently linking ing observed. The Rolling Stones Magazine published onYouTube URIs. The aim of blogs is to provide easily new 12/9/1994 a list of 500 songs [5]. ”The song list was chosentextual content 8enriched with media and/or links to external ODU  CS   95  F10 Videos  Copies  in  YouTube based on votes by 172 musicians, critics, and music-industrysites, and 12/15/10 entries inMa3hias  Prellwitz order. Three blogs display descending figures.” [9] The set distribution in figure 3 shows stability of 7from Google’s blog publishing services Blogger.com7 were songs of older age between the 1960s and 1980s. Examples
  • 8. Popular  Music Selected  Music  Blogs N/A Percentage & Country 41 - 50 Blues 31 - 40 Childrens 21 - 30 Classical 11 - 20 Electronic 1 - 10 Folk Funk / Soul Hip Hop Jazz Latin Non-Music # Songs Pop 41 - 50 Reggae 31 - 40 Rock 21 - 30 11 - 20 Stage & Screen 1 - 10 World N/A 1960 1970 1980 1990 2000 2010 Dataset: Music Blogs at blogspot.com, Number of set items: 742Figure 2: Set distribution: Genre/Publication Year, Dataset: Music Blogs at blogspot.com, against Discogs. Source: www.discogs.com; Multiple genre assignments possibleNumber of items: 742 ODU  CS  895  F10 Videos  Copies  in  YouTube 12/15/10 Ma3hias  Prellwitz 8
  • 9. Popular  Music The  500  Greatest  Songs  of  all  Time N/A Percentage & Country 61 - 70 Blues 51 - 60 Childrens 41 - 50 Classical 31 - 40 Electronic 21 - 30 Folk 11 - 20 Funk / Soul 1 - 10 Hip Hop Jazz Latin Non-Music Pop Reggae # Songs Rock 11 - 15 Stage & Screen 6 - 10 World 1-5 N/A 1960 1970 1980 1990 2000 2010 Dataset: The 500 Greatest Songs of All Time by Rolling Stone, Number of set items: 500Figure 3: Set distribution: Genre/Publication Year, Dataset: The 500 Greatest Songs of All Time by Rolling Source: www.discogs.com; Multiple genre assignments possibleStone, against Discogs. Number of items: 500 ODU  CS  895  F10 Videos  Copies  in  YouTube 12/15/10 Ma3hias  Prellwitz 9
  • 10. Total  Result  Size  Range US  Top  40  Singles  Charts  of  9/25/10 d information by YouTube itself or via 123,239 elling link. 1e+05 Lady  Gaga 83,298 Alejandro 43,945 ility of additional music-related 10000 YouTube Amazon Top 40 x% x% x% x% 1000gs of all time x% x% Result Size one of these high-quality data, other 100 66 Selena  Gomez  &  The   considered to get information about 35 Scene In previous smaller-scale tests we ex- querying with the free-from video title 26 A  Year  Without  Rain APIs (MusicBrainz, Amazon Product 10M, Rhapsody) as well as via Google ande with site parameters of music-related Medianent URI syntaxes where artist and title Median (item touching zero) 1 Min-Max Range parsed easily out. Best quality from om Last.FM (65%) and Amazon (43%) 0 5 10 15 20 25 30 35 40 45 t matched the song of the YouTube e we queried. Due to misspellings and Set items nt terms (’offical’, ’HQ’, ’lyrics’, etc.), erm against search engines with a site Figure 4: Total Result Size log(2), Dataset: Top 40 improvement to 73% at the first result US Single Charts of 9/25/10.last.fm/music via Google search en- related services without available APIs Google against www.ilike.com with inst www.ilike.comS  895  F10 38% success Copies  in  YouTube blogs at blogspot.com ODU  C with Videos   Music 12/15/10 Ma3hias  Prellwitz similar high variation of announced total result sizes of A t item were the both outstanding best 10hod. 1,000 or more also applies to the second dataset (Figure
  • 11. Total  Result  Size  RangeSelected  Music  Blogs 264,753 2 Lady  Gaga 1e+05 256,205 1 Bad  Romance 232,936 0 682 741 10000 Result Size 1000 100 10 Mariah  Carey  featuring   0 Juelz  Santana  &  Bone   Median 0 Median (item touching zero) Thugs-­‐n-­‐Harmony 1 Min-Max Range 0 Dont  Forget  About  Us 0 100 200 300 400 500 600 700 Set items Figure 5: Total Result Size log(2), Dataset: Music Figure 6: Total Result Size log Blogs at blogspot.com 500 Songs of All Time term including query method. Table 3: First repODU  CS  895  F10 Videos  Copies  in  YouTube12/15/10 Ma3hias  Prellwitz Dataset 11 4.3 Result Uniqueness US Single Charts Top 40
  • 12. Total  Result  Size  Range The  500  Greatest  Songs  of  all  Time 174,088 1e+05 1 Michael  Jackson 2 162,937 Billie  Jean 1 145,076 0 0 10000 493 500 682 741 1000 Result Size 100 10 0 The  Isley  Brothers Median 0tem touching zero) Median (item touching zero) That  Lady  (Part  1  and  2)Range 1 Min-Max Range 0 200 300 400 500 600 700 0 100 200 300 400 500 Set items Set items Result Size log(2), Dataset: Music Figure 6: Total Result Size log(2), Dataset: The Topot.com 500 Songs of All Timeonce zero results over time. Out of these, had a median uniqueness that reflects almost half of thed a result, which might95  F10due to the ac- opies  in  maximum possible retrievable results. (Table 4.3) ODU  CS  8 12/15/10 be Videos  C YouTube Ma3hias  Prellwitz tist and song title information and the all 12ery method.
  • 13. URI  Unavailability  Rooted  from  a  selected  collec7on 1.00 25 Median Absolute Deviation 0.98 20 0.96 0.94 15 0.92 10 Median Absolute Deviation Datasets 0.90 Top 40 US Singles Charts 0.88 5 Music Blogs @ blogspot.com The 500 Greatest Songs 0.86 0 0 1 2 3 4 5 6 7 8 9 10 Weeks -5 -10 Figure 7: Gone URIs from collection -15 1.0 Top 40 US Singles Charts Datasets Music Blogs @ blogspot.com -20 The 500 Greatest Songs Top 40 US Singles Cha Music Blogs @ blogspo egression -25 The 500 Greatest SongODU  CS  895  F10 Videos  Copies  in  YouTube12/15/10 Ma3hias  Prellwitz 13 -9 -8 -7 -6
  • 14. The 500 Greatest Songs Median Absolute 0.86 0URI  Unavailability   5 0 1 2 3 4 6 7 8 9 10 Weeks -5Expected  Half-­‐life -10 Figure 7: Gone URIs from collection -15 1.0 Top 40 US Singles Charts Datasets Music Blogs @ blogspot.com -20 The 500 Greatest Songs Top 40 US Singles Cha Music Blogs @ blogspo Linear Regression -25 The 500 Greatest Song -9 -8 -7 -6 Figure 9: New publis Half life dataset 0.5 0 3 6 9 12 15 18 Month most of them have been p for the gone URIs almost a Figure 8: Predicted Half life of collection within a year (99.6%). For that contains also items re and considering that YouT4.5 Publish and Removal be discovered that also theFollowing these results, evaluation was undertaken to ob- unavailable videos existedserve the daily rate of new published and removed videos US Top 40during F10 observationouTube ODU  CS  895   the 12/15/10 Videos  Copies  in  Y period. According to the higher re- Ma3hias  Prellwitz Singles Charts 14gression rate of a collection top current chart songs, figure Music Blogs
  • 15. URI  Publica7on  and  Removal  Rate.00 25 Median Absolute Deviation.98 20 New URIs.96.94 15.92 10 Median Absolute Deviation.90.88 5.86 0 -5 -10 -150 Datasets -20 Gone URIs Top 40 US Singles Charts Music Blogs @ blogspot.com Linear Regression -25 The 500 Greatest Songs -9 -8 -7 -6 -5 -4 -3 -2 -1 0 Weeks Figure 9: New published and removed URIs by5 dataset ODU  CS  895  F10 Videos  Copies  in  YouTube 12/15/10 Ma3hias  Prellwitz 15 most of them have been published this year, and therefore
  • 16. for the gone URIs almost all removed videos had a lifetime tion within a year (99.6%). For the set ’Top 500 songs of all time’ that contains also items reflecting songs back to the 1960s Life7mes  of  unavailable  videos and considering that YouTube was founded in 2005, it can be discovered that also there the majority (62.4 %) of now ken to ob- unavailable videos existed for less than one year. ved videos US Top 40 higher re- Singles Charts ngs, figure Music Blogsf new pub- The 500elonging to Greatest Songs ated songs. 0 10 20 30 40 50 60 70 80 90 100API once a 0-1 1-2 2-3 3-4 4-5 Percentetrieved by ation. Ad-can be seen Figure 10: YouTube video lifetimes, separated bybackwards. years in a initial US Top 40be synchro- Breaking the the interval of the first year down into week Singles Charts Table 4: Video Gonepublication periodsBlogs here only focusing on the first four reflecting Music and Gone Reason are able to a lifetime of a month or less brings up the results shown The 500 Third-party triggered Greatest Songs in figure 11. The upper bar displays those of the set of This video contains content from [c current chart0 songs, and 30 40 half of the removed URIs 10 20 almost 50 60 70 80 90 100 owner], who has blocked it (in your Percent (41.3%) had a lifetime - of a2 -month 4 or less. Getting into 0-1 1 2 3 3- on copyright grounds. higher granularity 16.0% existed for only up to one week.tion period This video is no longer available be In comparison, the lifetime of gone URIs from the set ’Topulating the Figure 11: YouTube video lifetimes, separated by YouTube account associated with t 500 songs of all time’ was for 25% less than a month and forGdata API weeks (zoom into first four adding up to lifetimes has been terminated due to multip 9.9% less than a week. of monitor within one month) party notifications of copyright infrin the daily This video is no longer availableat URI did 4.7 Reasons for gone YouTube videos copyright claim by [copyright owne ch. Figure Neglecting the specifics copy right holders. grouping the rea- triggered by claims by of each dataset and So with, a video YouTube triggered s retrieved ODU  CS  895  F10(Table Videos  Copies  in  Yof or the associated accountURI that sons blocked, removed, all YouTube video watch close by was 4.7) why ouTube 12/15/10 Ma3hias  Prellwitz This video is no longer available beof 9/25/10 became unavailable during 23.3% of the removed videos, YouTube afterwards. For the observation period shows 16 YouTube account associated with t YouTube removed a video or discontinued the user account,
  • 17. YouTube removed a video or discontinued the user account, has been terminated. e.g. due to violations against one of its policies or its terms This video has been removed as a violation 3.1 of service. For only 13.2% a user it self took action to remove of YouTube’s [...] policy one if his videos or closed its account. The remaining group This video has been removed because its con- 2.8 Reasons  for  no  unavailable  videos summarizes observed crawling errors or status changes of video, e.g. the uploading user set a video to private, or it is tent violated YouTube’s Terms of Service. This video contains content from [copyright 2.4 no longer directly available due to its content. owner]. It is not available (in your country). With the focus on popular music videos it can be concluded This video is no longer available because the 1.9 that according to the interpretation of the gone messages, YouTube account associated with this video copyright owners – here music Video companies – have the Table 4: record Gone Reasons has been terminated due to repeated copy- Gone Reason main influence and assertiveness of letting their copyrighted Percent right infringements. material removed that was uploaded by others without their 48.8 Third-party triggered User triggered 13.2 90 This video contains content from [copyright 100 given permission. 26.0 This video is no longer available because the 12.3 Percent owner], who has blocked it (in your country) uploader has closed their YouTube account. 4.8 Summary grounds. on copyright This video has been deleted. 0.9 This video is no longer available because the 18.3 Other/Errors 14.3 The evaluation of the dataset showed also over a restricted ated by YouTube account associated with this video Authentication required (see 2.2 reasons) 7.8 monitoring period of max. 2.5 months that a high fluc- ifetimes has been terminated due to multiple third- N/A 3.3 tuation of music-related videos on YouTube exists. As we party notifications of copyright infringement. Verification required (see 2.2 reasons) 2.3 sorely focused on popular music, besides removing a video This video is no longer available due to a 4.5 Upgrade to Flash Player 10 0.7 by a user or closing its account the majority of removing a copyright claim by [copyright owner]h, a video video copy is due to its copyrighted content and its removal The video you have requested is not available <0.1 YouTube triggered 23.7 close by initiated by the copyright holder of its content or YouTube is This video is not availabe in your country <0.1d videos, itself removed it due is no longer available because the or 13.5 This video to violation of its terms of service The video is a duplicate copy of a previously <0.1 YouTube account associated with this video policies. Hence, choosing a particular copy of that classifi- uploaded video account, has been terminated. cation of videos and publish the given URI has a high risk its terms This video has been removed as a violation 3.1to remove becoming unavailable. of of YouTube’s [...] policying group that its search engine index is updated very shorthand.hanges of 5. RETRIEVAL AND removed because its con- AP- 2.8 This video has been PRESERVATION Continuing with the initial mentioned example of a video tent violated YouTube’s Terms of Service. e, or it is PROACHES contains content from [copyright This video 2.4 copy of the song ’Satisfaction’ by ’The Rolling Stones’ that As it was owner]. It is not once a video your country). its discovered that available (in is gone, neither was removed due to copyright claims and its disappearance valuable metadata from the HTML representation of the 1.9 This video is no longer available because the discovered on 4/9/10, and searching Google search engines oncluded given video watch URI will associated with this video itsmessages, YouTube account be no longer available, nor with its video watch URI http://www.youtube.com/watch? ATOM representation from the Gdata API returns the basic has been terminated due to repeated copy- v=214szPQBUYc bought up 34 results on 12/13/10 where all have the video characteristics. (2.2). of them were not affiliated with YouTube. Parsing out ex-pyrighted right infringements. User triggered 13.2 act metadata about the desired artist and song title fromhout their 5.1 Existing web no longer available because the This video is infrastructure 12.3 the HTML neighborhood might have the vulnerability of As YouTube is no longerclosed their YouTube account. video misspellings, abbreviations, additions, or failure, if the sur- uploader has a source for the aboutness of a once it is This video existing public web infrastructure was 0.9 gone, the has been deleted. rounding markup does not consider the video content. observed with its likeliness of holding a video’s informationrestricted Other/Errors 14.3 afterwards.high fluc- Authentication required (see 2.2YouTube ODU  CS  895  F10 Videos  Copies  in   reasons) 7.8 s. As we 12/15/10 N/A Ma3hias  Prellwitz 3.3 5.1.2 Web Archives 17g a video 5.1.1 Search Engine Caches 2.2 reasons) Verification required (see 2.3 Utilizing web archives – preserving websites over time by
  • 18. When  a  YouTube  video  disappears‣ video  ,tle     The  Rolling  Stones  -­‐  Sa,sfac,on‣ url       h3p://www.youtube.com/watch?v=214szPQBUYc‣ published   2009-­‐06-­‐13  13:44     removed     2010-­‐04-­‐09  (300  days  online) HTTP/1.1 303 See Other Location: http://www.youtube.com/index? ytsession=JzUNcRUYijSVoqkvtLNiXZG... Content-Type: text/html; charset=utf-8ODU  CS  895  F10 Videos  Copies  in  YouTube12/15/10 Ma3hias  Prellwitz 18
  • 19. Metadata  purged  from  YouTube  Databases‣ previous  example   video  ,tle:  The  Rolling  Stones  –  Sa,sfac,on‣ removal  reason     This  video  is  no  longer  available  due  to  a  copyright  claim           by  ABKCO.  ‣ Video  feed   ! http://gdata.youtube.com/feeds/api/videos/214szPQBUYc! ! ! HTTP/1.1 403 Forbidden!Content-Type: text/html; charset=UTF-8 Private  video‣ Related  videos  ! http://gdata.youtube.com/feeds/api/videos/214szPQBUYc/related HTTP/1.1 404 Not Found Content-Type: text/html; charset=UTF-8 Parent  Video  not  found‣ Video  comments ! http://gdata.youtube.com/feeds/api/videos/214szPQBUYc/comments HTTP/1.1 200 OK Content-Type: application/atom+xml; charset=UTF-8ODU  CS  895  F10 Videos  Copies  in  YouTube12/15/10 Ma3hias  Prellwitz 19
  • 20. Metadata  Normaliza7on dereferencing  ASIN  via  amazon  ws: Ar,st:     Michael  JacksonODU  CS  895  F10 Videos  Copies  in  YouTube12/15/10 Ma3hias  Prellwitz Title:       Billie  Jean  (Single  Version) 20
  • 21. Availability  of  music-­‐related  metadata‣ parsed  out  only  at  the  fiinformation RI  showed  up  in  the  result  list  fveryhe  first  ,me to users in term attached music-related rst  ,me  a  U by YouTube itself or via or  t high interest an Amazon affiliate selling link. following one of the search terms ‣ YouTube  crawling  restric,ons video copies of such a song. Table 1: Availability of additional music-related metadata 1e+05 Dataset YouTube Amazon US Single Charts Top 40 42.0% 41.4% Total URI count: 85,831 36,040 35,491 Music Blogs 11.9% 11.6% 10000 Total URI count: 582,068 69,068 67,483 The 500 greatest songs of all time 30.0% 28.2% Total URI count: 313,542 94,275 88,290 1000 Result Size‣ Remaining  not having one of these high-quality data, other For URIs por,on ‣ query  video  totle  against  music  to get information search  engines methods have , be considered related  services  via   about 100 artist and song title: In previous smaller-scale tests we ex- ‣ the quality of querying with the free-from video title plored Google/Yahoo!  with  site  parameter  www.last.fm/music against music-related APIs (MusicBrainz, Amazon Product Affiliate API, Last.fM, Rhapsody) as well as via Google and 10 Yahoo! search engine with site parameters of music-related sites having transparent URI syntaxes where artist and title MedianODU  CinformationVideos  Copies  in  YouTube S  895  F10 could be parsed easily out. Best quality from Median (item touching zero)12/15/10 Ma3hias  Prellwitz APIs were returned from Last.FM (65%) and Amazon (43%) 1 Min-Max Range 21 where the first result matched the song of the YouTube
  • 22. Retrieving  and  preserving  a  video’s  metadata  ‣ Ac,ve  preservaon  a3empt  once  a  video  copy  is  available ‣ Parse  HTML  out  for  structured  music-­‐related  metadata ‣ YouTube  generated  meta  data ‣ AmazonMP3  affiliate  link ‣ search  engines  with  free-­‐form  video  ,tle  against  music-­‐related  websites‣ Preserving  metadata  into  the  public  web  infrastructure ‣ (micro)  blogging  systems ‣ online  bookmark  servicesODU  CS  895  F10 Videos  Copies  in  YouTube12/15/10 Ma3hias  Prellwitz 22
  • 23. Preserva7on  PrototypeODU  CS  895  F10 Videos  Copies  in  YouTube12/15/10 Ma3hias  Prellwitz 23
  • 24. Metadata  preserva7onExample:  twiCerODU  CS  895  F10 Videos  Copies  in  YouTube12/15/10 Ma3hias  Prellwitz 24
  • 25. Poin7ng  to  a  Resolver  service‣ http://ytresolve.cs.odu.edu/r/http://www.youtube.com/ watch?v=214szPQBUYc/‣ Author-­‐side  approach ‣ content  creator  points  directly  to  a  resolver  service‣ Server-­‐side  approach ‣ Plugin/Renderer  class  automa,cally    rewrites   YouTube  video  watch  URIs   to  resolver  service‣ Client-­‐side  approach ‣ Web-­‐Browser  plugin  intercepts  click  on     Youtube  video  watch  URIs and  redirects  to  resolver  serviceODU  CS  895  F10 Videos  Copies  in  YouTube12/15/10 Ma3hias  Prellwitz 25
  • 26. YouTube  Resolver  service http://www.youtube.com/watch?v=214szPQBUYc http://www.youtube.com/v/214szPQBUYc http://www.youtu.be/214szPQBUYc http://www.youtube.com/user/WEASELxLOVER#p/a/u/2/214szPQBUYc HTTP/1.1 303 See Others HTTP/1.1 200 OK http://www.youtube.com/ HTTP/1.1 303 See Others * index?ytsession=... HTTP redirect Status search  for  preserved    metadata ‣  in  list  of  designated  accounts *) http://www.youtube.com/verify_controversy... http://www.youtube.com/verify_age... exact  best  available  granularity https://www.google.com/accounts/ServiceLogin... http://www.youtube.com/das_captcha.. query  YouTube  API  with  those Provided  (and  evaluate)   alterna,ve  copiesODU  CS  895  F10 Videos  Copies  in  YouTube12/15/10 Ma3hias  Prellwitz 26
  • 27. Future  Work‣ Evalua,on  of  preserva,on  and  retrieval  quality  of  chosen  services   ‣ exchange  services‣ addi,onal  automa,on  of  preserva,on  process ‣ once  YT  URI  was  passed  for  resolving‣ Evalua,on  of  retrieved  available  copies   ‣ redirect  to  best  copy  instead  of  returning  a  list  to  choose‣ Consider  interna,onal  requesters ‣ taking  requester’s  loca,on  (country)  into  accountODU  CS  895  F10 Videos  Copies  in  YouTube12/15/10 Ma3hias  Prellwitz 27
  • 28. Summary ‣ Poin,ng  to  a  specific  YouTube  video  copy  by  its  URI  has  a  risk  of  disappearance ‣ alterna,ve  copies  over  ,me  available ‣ YouTube  URIs  unlikely  to  be  cached  once  gone ‣ YouTube  metadata  only  reliable  for  available  URIs ‣ ac,ve  preserva,on  a3empt ‣ Introducing  a  level  of  indirec,on:  Resolver  service ‣ check  URI  status  and  loca,on  header ‣ search  the  public  web  for  injected  metadata ‣ query  for  alterna,ve  copiesODU  CS  895  F10 Videos  Copies  in  YouTube12/15/10 Ma3hias  Prellwitz 28

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