Unlike modern Acrobat DC, version X was sold as a perpetual license (one-time purchase). Common "RH" Reference
Leo sat in the dark basement. Slowly, memories returned—his mother’s laugh, his childhood home. The library was a foreclosure again. But on the floor, beneath the dust, was a single word burned into the concrete: Adobe Acrobat Pro X v10.0 Multilingual -RH-
His phone rang. It was his landlord.