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<Insert usual warning about editing the system BIOS and ending up with a brick here>
What you will need to do is export the BIOS data as a file, edit the data (in this case removing the ownership details) and then reflash the BIOS using the newly created image.
The BIOS editing tools will calculate all the new checksums for you.
Do not do this unless you are certain you know what you are doing!
The tools you need for the d530 are HERE
You need the REPSET utility. Use REPGET to create the file from the target PC. This will produce a text file CPQSETUP.TXT use a text editor to remove the company details. Then use REPSET to flash the revised CPQSETUP.TXT into the BIOS.
As a general rule change as little as possible with BIOS editors. Even when you are familiar with them the odd accidental character can really mess things up although most times if you've successfully created a reference TXT file you can recover.