If the publishing house secures a placement with an artist during this period (it is not necessarily Celine or Whitney), the publishing house becomes a permanent copyright holder of the song. The contract could also determine whether saving a movie or television use is sufficient for the song (instead of a disc placement) for the publisher to retain a permanent copyright. If the seller wishes to retain the right to buy back the work preferably for someone else, if the buyer decides to sell it in the future, then this agreement is more appropriate. There are 6 basic types of conventions that songwriters sign with a music publishing house. They are the Individual Song Agreement, the Exclusive Songwriter`s Agreement, the Co-Publishing Agreement, the Participation Agreement, the Administration Agreement and the Foreign Sub-Publishing Agreement.