There may also be an interpretation in which you're not even modifying the work by using an adblocker. If you define the work as the source code you're not act

There may also be an interpretation in which you're not even modifying the work by using an adblocker. If you define the work as the source code you're not actually modifying it. You're just declining to download subsequent works (iframes, flash, whatever). (not a lawyer)