Adobe Acrobat-Does it drop features in time?

I have been using Adobe Acrobat 5.0 (paid full version) and have been saving the Adobe downloaded PDF forms from an investment advisor, to my computer under both Adobe and Word directorys as .pdf files so I can read and access later. Today I downloaded the latest report but Acrobat will not let me copy or save it. Question: Does Adobe Acrobat disable those save/copy features after so long (current version is 7.0)? If not, can anyone tell me if the software has been corrupted in some way and how to fix it?