DVD Studio Pro 4.0 can be found on archive.org. It's a hefty download, around 7GBs. Don't forget to lock the .toast if you want it to be read only. Hopefully someone with better internet will be able to reupload it here.
https://archive.org/details/691-5358-A0ZDVD_Studio_Pro_v4.0._Install_DVD_DL
DVD Studio Pro 4 - Technical Specifications (from https://support.apple.com/kb/sp640?locale=en_US)
• Mac computer with an Intel processor
• 1GB of RAM (2GB of RAM recommended when working with compressed HD and uncompressed SD sources; 4GB of RAM recommended when working with uncompressed HD sources)
• ATI or NVIDIA graphics processor. Integrated Intel graphics processors are not supported except the Intel HD Graphics 3000.
• 128MB of VRAM
• Display with 1280-by-800 resolution or higher
• Mac OS X v10.5.6 or later
• QuickTime 7.6 or later
• DVD drive for installation
• For writing finished projects to disc: an Apple SuperDrive or other DVD recorder
• For writing finished projects to a double-layer disc: a double-layer-compatible recorder and • double-layer media
• For transporting projects that contain copy-protection or dual-layer features to a replicator: a DLT drive, external drive, or Internet transfer of the project’s disk image
