If it is a telephone request, you must read the warning. It is recommended that you put a warning label on computers, VCRs. Face to face teaching eliminates some of the problems with showing a video. In regards to computer software, an archival copy is ok. You can load from the disk to a hard drive.
Single use can be put on many computers but only one person at a time can use.
Single use can not be put on a network even though one person uses at a time. Listserv submissions are copyrighted. Linking to sites is ok, to move information to a site is not. You can not videotape the reading of a book. To transfer the format of an item, ie an old record to a tape, you must write for permission.