with this; together with this thing; at the same time as this.
Old English 'here' (here) + 'with' + 'all' (wholly). A Middle English formation combining spatial and instrumental prepositions for emphasis.
The 'all' at the end is doing real work here—it's not just saying 'with this' but 'WITH THIS AND EVERYTHING THAT COMES WITH IT,' making it sound appropriately dramatic and legal.
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