On the ECL2.0, can I use the Arcserve license which I purchased from another vendor company?

There is no restriction on you to use your BYOL license which you purchased from another vendor company.
But as we didn't verify all of BYOL license, please use your BYOL license after verifying the license by yourself.
Regarding our verified products and usage methods, please refer to the following site.
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Arcserve Solution Guide
/en/documents/solution-guides/
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In addition, please note that if you use your BYOL license and you would like to contact to Arcserve technical support, you need to contact via another vendor company or directly to Arcserve.
And when using it, it is necessary to satisfy the following conditions.
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Available countries and regions except for ECL2.0 regions to use license for migration to ECL2.0
/en/documents/service-descriptions/rsts/arcserve/arcserve.html#ecl2-0ecl2-0
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