A mechanism for the purchase of tags for copies of software ensures that identity
of the purchaser of a tag table identifier value included in a purchased tag is
not revealed. A mechanism of Call-Ups from the user device to a guardian center
ensures that each tag table identifier value appears in only one user device and
that the data included in a tag table and other data stored in the user device
for the purpose of protecting vendor's and owner's rights in software, cannot be modified.
