The licensing model is something that has been agreed on and there must be contracts being singed about that. Emails and other communication may be added to that. The SID renewal (having the setinit embedded) are also good sources for information. @Dkblue74 it is very good action to have that reviewed independent, there could by saving (unnecessary ones) not optimized usage for what is there. It is SAS in the position getting as much money being payed for and your client as less as possible. For old contracts there can be a problem as of virtualization. As the difference virtual/physical processors is not being mentioned the supplier can require to bare-iron to be licensed. There is another area to review and that are laws that applicable. If you are in European are the directive is: http://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=OJ:L:2009:111:0016:0022:EN:PDF It states that when not explicitly mentioned, backups verifications for DR, technical integrations testing etc, are included with the license for normal for normal operations. It may not be forbidden by a supplier. The directive is protecting both parties the supplier and the customer. I know of both licensing problems by bad experiences.
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